USGS Body-Wave Moment Tensor Solution
SOUTHEASTERN ALASKA
13/01/14 14:55:52.84 Epicenter: 55.078 -134.533 MW 5.5 USGS MOMENT TENSOR SOLUTION Depth 11 No. of sta: 39 Moment Tensor; Scale 10**17 Nm Mrr= 0.19 Mtt=-1.68 Mpp= 1.49 Mrt= 0.42 Mrp= 0.34 Mtp= 1.36 Principal axes: T Val= 2.10 Plg=14 Azm=291 N 0.11 75 84 P -2.22 7 200 Best Double Couple:Mo=2.2*10**17 NP1:Strike=335 Dip=75 Slip= 175 NP2: 66 85 15
The figure above shows a visual representation of the style of faulting (focal mechanism)
derived from the estimated moment tensor.
Shaded areas show quadrants of the focal sphere in which the P-wave first-motions
are away from the source, and unshaded areas show quadrants
in which the P-wave first-motions are toward the source.
The dots represent the axis of maximum compressional strain
(in black, called the "P-axis")
and the axis of maximum extensional strain (in white, called the "T-axis")
resulting from the earthquake.
